破解版的Jpedal.jar 代码如下： package fukun; /** * Example to convert PDF to highest possible quality images * Also consider org.jpedal.examples.images.ConvertPagesToImages for faster if quality less important * * Useful blog article at http://www.jpedal.org/PDFblog/2009/07/pdf-to-image-quality/ * * It can run from jar directly using the command * * java -cp libraries_needed org/jpedal/examples/images/ConvertPagesToHiResImages pdfFilepath inputValues * * where inputValues is 2 values * * First Parameter: The full path including the name and extension of the target PDF file. * Second Parameter: The output image file type. Choices are tif, jpg and png. * * See also http://www.jpedal.org/javadoc/org/jpedal/constants/JPedalSettings.html for settings to customise */ /** * =========================================== * Java Pdf Extraction Decoding Access Library * =========================================== * * Project Info: http://www.jpedal.org * (C) Copyright 1997-2012, IDRsolutions and Contributors. * * This file is part of JPedal * This source code is copyright IDRSolutions 2012 * * --------------- * ConvertPagesToHiResImages.java * --------------- */ import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.*; import javax.imageio.IIOImage; import javax.imageio.ImageIO; import javax.imageio.ImageTypeSpecifier; import javax.imageio.metadata.IIOMetadata; import javax.imageio.plugins.jpeg.JPEGImageWriteParam; import javax.imageio.stream.ImageOutputStream; import com.sun.imageio.plugins.jpeg.JPEGImageWriter; import org.jpedal.PdfDecoder; import org.jpedal.color.ColorSpaces; import org.jpedal.exception.PdfException; import org.jpedal.fonts.FontMappings; import org.jpedal.objects.PdfPageData; import org.jpedal.utils.LogWriter; import org.jpedal.io.ColorSpaceConvertor; import org.jpedal.io.JAIHelper; import org.jpedal.constants.JPedalSettings; import org.jpedal.constants.PageInfo; import org.w3c.dom.Element; public class ConvertPagesToHiResImages { private static boolean debug = false; /** correct separator for OS */ final static String separator = System.getProperty("file.separator"); // only used if between 0 and 1 private float JPEGcompression = -1f; public ConvertPagesToHiResImages() { } public static void main2(String[] args) throws Exception { /* * Change these variables */ String fileType, pdfFile; if (args != null && args.length > 1) { pdfFile = args[0]; fileType = args[1]; // open the file if (pdfFile.toLowerCase().endsWith(".pdf") && (fileType.equals("jpg") || fileType.equals("jpeg") || fileType.equals("png") || fileType.equals("tiff") || fileType .equals("tif"))) { new ConvertPagesToHiResImages(fileType, pdfFile); } else { // open the directory File testDir = new File(pdfFile); if (testDir.isDirectory()) { /** * get list of files and check directory */ String[] files = null; File inputFiles; /** * make sure name ends with a deliminator for correct path * later */ if (!pdfFile.endsWith(separator)) pdfFile = pdfFile + separator; try { inputFiles = new File(pdfFile); files = inputFiles.list(); } catch (Exception ee) { LogWriter.writeLog("Exception trying to access file " + ee.getMessage()); } /** now work through all pdf files */ for (String file : files) { if (file.toLowerCase().endsWith(".pdf")) new ConvertPagesToHiResImages(fileType, pdfFile + file); } } else System.out .println("The file to be processed has to be a pdf and the output filetype can only be jpg,png or tiff"); } } else { System.out .println("Not enough arguments passed in! Usage: \"C:\\examples\\1.pdf\" \"jpg\""); } } /** * main constructor to convert PDF to img * * @param fileType * @param pdfFile * @throws Exception */ public ConvertPagesToHiResImages(String fileType, String pdfFile) throws Exception { long startTime = System.currentTimeMillis(); String outputPath = pdfFile.substring(0, pdfFile.toLowerCase().indexOf( ".pdf")) + separator; File outputPathFile = new File(outputPath); if (!outputPathFile.exists() || !outputPathFile.isDirectory()) { if (!outputPathFile.mkdirs()) { if (debug) System.err.println("Can't create directory " + outputPath); } } // PdfDecoder object provides the conversion final PdfDecoder decoder = new PdfDecoder(true); // mappings for non-embedded fonts to use // FontMappings.setFontReplacements(); decoder.openPdfFile(pdfFile); /** * this process is very flaxible to we create a Map and pass in values * to select what sort of results we want. There is a choice between * methods used and image size. Larger images use more memory and are * slower but look better */ Map mapValues = new HashMap(); /** USEFUL OPTIONS */ // do not scale above this figure mapValues.put(JPedalSettings.EXTRACT_AT_BEST_QUALITY_MAXSCALING, 2); // alternatively secify a page size (aspect ratio preserved so will do // best fit) // set a page size (JPedal will put best fit to this) mapValues.put(JPedalSettings.EXTRACT_AT_PAGE_SIZE, new String[] { "2000", "1600" }); // which takes priority (default is false) mapValues.put(JPedalSettings.PAGE_SIZE_OVERRIDES_IMAGE, Boolean.TRUE); PdfDecoder.modifyJPedalParameters(mapValues); if (debug) System.out.println("pdf : " + pdfFile); try { /** * allow output to multiple images with different values on each * * Note we REMOVE shapes as it is a new feature and we do not want * to break existing functions */ String separation = System.getProperty("org.jpedal.separation"); if (separation != null) { Object[] sepValues = new Object[] { 7, "", Boolean.FALSE }; // default // of // normal if (separation.equals("all")) { sepValues = new Object[] { PdfDecoder.RENDERIMAGES, "image_and_shapes", Boolean.FALSE, PdfDecoder.RENDERIMAGES + PdfDecoder.REMOVE_RENDERSHAPES, "image_without_shapes", Boolean.FALSE, PdfDecoder.RENDERTEXT, "text_and_shapes", Boolean.TRUE, 7, "all", Boolean.FALSE, PdfDecoder.RENDERTEXT + PdfDecoder.REMOVE_RENDERSHAPES, "text_without_shapes", Boolean.TRUE }; } int sepCount = sepValues.length; for (int seps = 0; seps < sepCount; seps = seps + 3) { decoder.setRenderMode((Integer) sepValues[seps]); extractPageAsImage(fileType, outputPath, decoder, "_" + sepValues[seps + 1], (Boolean) sepValues[seps + 2]); // boolean makes // last transparent // so we can see // white text } } else // just get the page extractPageAsImage(fileType, outputPath, decoder, "", false); } finally { decoder.closePdfFile(); } System.out.println("time=" + (System.currentTimeMillis() - startTime) / 1000); } /** * convenience method to get a page as a BufferedImage quickly - for bulk * conversion, use the other methods */ public static BufferedImage getHiresPage(int pageNo, int scaling, String pdfFile) { BufferedImage imageToSave = null; final PdfDecoder decoder = new PdfDecoder(true); try { // mappings for non-embedded fonts to use // FontMappings.setFontReplacements(); decoder.openPdfFile(pdfFile); PdfPageData pageData = decoder.getPdfPageData(); int width = scaling * pageData.getCropBoxWidth(pageNo); int height = scaling * pageData.getCropBoxHeight(pageNo); Map mapValues = new HashMap(); /** USEFUL OPTIONS */ // do not scale above this figure mapValues.put(JPedalSettings.EXTRACT_AT_BEST_QUALITY_MAXSCALING, 2); // alternatively secify a page size (aspect ratio preserved so will // do best fit) // set a page size (JPedal will put best fit to this) mapValues.put(JPedalSettings.EXTRACT_AT_PAGE_SIZE, new String[] { String.valueOf(width), String.valueOf(height) }); // which takes priority (default is false) mapValues.put(JPedalSettings.PAGE_SIZE_OVERRIDES_IMAGE, Boolean.TRUE); PdfDecoder.modifyJPedalParameters(mapValues); imageToSave = decoder.getPageAsHiRes(pageNo, null, false); } catch (PdfException e) { e.printStackTrace(); } finally { decoder.closePdfFile(); } return imageToSave; } /** * actual conversion of a PDF page into an image * * @param fileType * @param outputPath * @param decoder * @param prefix * @param isTransparent * @throws PdfException * @throws IOException */ private void extractPageAsImage(String fileType, String outputPath, PdfDecoder decoder, String prefix, boolean isTransparent) throws PdfException, IOException { // page range int start = 1, end = decoder.getPageCount(); // container if the user is creating a multi-image tiff BufferedImage[] multiPages = new BufferedImage[1 + (end - start)]; /** * set of JVM flags which allow user control on process */ // ////////////////TIFF OPTIONS///////////////////////////////////////// String multiPageFlag = System.getProperty("org.jpedal.multipage_tiff"); boolean isSingleOutputFile = multiPageFlag != null && multiPageFlag.toLowerCase().equals("true"); String tiffFlag = System.getProperty("org.jpedal.compress_tiff"); boolean compressTiffs = tiffFlag != null && tiffFlag.toLowerCase().equals("true"); // ////////////////JPEG OPTIONS///////////////////////////////////////// // allow user to specify value String rawJPEGComp = System.getProperty("org.jpedal.compression_jpeg"); if (rawJPEGComp != null) { try { JPEGcompression = Float.parseFloat(rawJPEGComp); } catch (Exception e) { e.printStackTrace(); } if (JPEGcompression < 0 || JPEGcompression > 1) throw new RuntimeException( "Invalid value for JPEG compression - must be between 0 and 1"); } String jpgFlag = System.getProperty("org.jpedal.jpeg_dpi"); // ///////////////////////////////////////////////////////////////////// for (int pageNo = start; pageNo < end + 1; pageNo++) { if (debug) System.out.println("page : " + pageNo); /** * example1 - ask JPedal to return from decoding if file takes too * long (time is in millis) will reset after exit so call for each * page */ // decoder.setPageDecodeStatus(DecodeStatus.Timeout,new Integer(20) // ); /** * example2 thread which will ask JPedal to time out and return from * decoding will reset after exit so call for each page */ /** * Thread a=new Thread(){ public void run() { * * while(true){ //simulate 2 second delay try { Thread.sleep(2000); * } catch (InterruptedException e) { e.printStackTrace(); //To * change body of catch statement use File | Settings | File * Templates. } * * //tell JPedal to exit asap * decoder.setPageDecodeStatus(DecodeStatus.Timeout, Boolean.TRUE); * * } } }; * * //simulate a second thread a.start(); * * //see code after line decoder.getPageAsHiRes(pageNo); for * tracking whether JPedal timed out and returned / **/ /** * If you are using decoder.getPageAsHiRes() after passing * additional parameters into JPedal using the static method * PdfDecoder.modifyJPedalParameters(), then getPageAsHiRes() wont * necessarily be thread safe. If you want to use getPageAsHiRes() * and pass in additional parameters, in a thread safe mannor, * please use the method getPageAsHiRes(int pageIndex, Map params) * or getPageAsHiRes(int pageIndex, Map params, boolean * isTransparent) and pass the additional parameters in directly to * the getPageAsHiRes() method without calling * PdfDecoder.modifyJPedalParameters() first. * * Please see * org/jpedal/examples/images/ConvertPagesToImages.java.html for * more details on how to use HiRes image conversion */ BufferedImage imageToSave = decoder.getPageAsHiRes(pageNo, null, isTransparent); String imageFormat = System.getProperty("org.jpedal.imageType"); if (imageFormat != null) { if (isNumber(imageFormat)) { int iFormat = Integer.parseInt(imageFormat); if (iFormat > -1 && iFormat < 14) { BufferedImage tempImage = new BufferedImage(imageToSave .getWidth(), imageToSave.getHeight(), iFormat); Graphics2D g = tempImage.createGraphics(); g.drawImage(imageToSave, null, null); imageToSave = tempImage; } else { System.err .println("Image Type is not valid. Value should be a digit between 0 - 13 based on the BufferedImage TYPE variables."); } } else { System.err .println("Image Type provided is not an Integer. Value should be a digit between 0 - 13 based on the BufferedImage TYPE variables."); } } // show status flag /** * if(decoder.getPageDecodeStatus(DecodeStatus.Timeout)) * System.out.println("Timeout on decoding"); else * System.out.println("Done"); / **/ decoder.flushObjectValues(true); // System.out.println("w="+imageToSave.getWidth()+" h="+imageToSave.getHeight()); // image needs to be sRGB for JPEG if (fileType.equals("jpg")) imageToSave = ColorSpaceConvertor.convertToRGB(imageToSave); String outputFileName; if (isSingleOutputFile) outputFileName = outputPath + "allPages" + prefix + '.' + fileType; else { /** * create a name with zeros for if more than 9 pages appears in * correct order */ String pageAsString = String.valueOf(pageNo); String maxPageSize = String.valueOf(end); int padding = maxPageSize.length() - pageAsString.length(); for (int ii = 0; ii < padding; ii++) pageAsString = '0' + pageAsString; outputFileName = outputPath + "page" + pageAsString + prefix + '.' + fileType; } // if just gray we can reduce memory usage by converting image to // Grayscale /** * see what Colorspaces used and reduce image if appropriate (only * does Gray at present) * * Can return null value if not sure */ Iterator colorspacesUsed = decoder .getPageInfo(PageInfo.COLORSPACES); int nextID; boolean isGrayOnly = colorspacesUsed != null; // assume true and // disprove while (colorspacesUsed != null && colorspacesUsed.hasNext()) { nextID = (Integer) (colorspacesUsed.next()); if (nextID != ColorSpaces.DeviceGray && nextID != ColorSpaces.CalGray) isGrayOnly = false; } // draw onto GRAY image to reduce colour depth // (converts ARGB to gray) if (isGrayOnly) { BufferedImage image_to_save2 = new BufferedImage(imageToSave .getWidth(), imageToSave.getHeight(), BufferedImage.TYPE_BYTE_GRAY); image_to_save2.getGraphics().drawImage(imageToSave, 0, 0, null); imageToSave = image_to_save2; } // put image in array if multi-images (we save on last page in code // below) if (isSingleOutputFile) multiPages[pageNo - start] = imageToSave; // we save the image out here if (imageToSave != null) { /** * BufferedImage does not support any dpi concept. A higher dpi * can be created using JAI to convert to a higher dpi image */ // shrink the page to 50% with graphics2D transformation // - add your own parameters as needed // you may want to replace null with a hints object if you // want to fine tune quality. /** * example 1 biliniear scaling AffineTransform scale = new * AffineTransform(); scale.scale(.5, .5); //50% as a decimal * AffineTransformOp scalingOp =new AffineTransformOp(scale, * null); image_to_save =scalingOp.filter(image_to_save, null); */ if (JAIHelper.isJAIused()) JAIHelper.confirmJAIOnClasspath(); if (JAIHelper.isJAIused() && fileType.startsWith("tif")) { com.sun.media.jai.codec.TIFFEncodeParam params = new com.sun.media.jai.codec.TIFFEncodeParam(); if (compressTiffs) params .setCompression(com.sun.media.jai.codec.TIFFEncodeParam.COMPRESSION_PACKBITS); if (!isSingleOutputFile) { BufferedOutputStream os = new BufferedOutputStream( new FileOutputStream(outputFileName)); javax.media.jai.JAI.create("encode", imageToSave, os, "TIFF", params); } else if (isSingleOutputFile && pageNo == end) { OutputStream out = new BufferedOutputStream( new FileOutputStream(outputFileName)); com.sun.media.jai.codec.ImageEncoder encoder = com.sun.media.jai.codec.ImageCodec .createImageEncoder("TIFF", out, params); List vector = new ArrayList(); vector.addAll(Arrays.asList(multiPages).subList(1, multiPages.length)); params.setExtraImages(vector.iterator()); encoder.encode(multiPages[0]); out.close(); } } else if (isSingleOutputFile) { // non-JAI } else if ((jpgFlag != null || rawJPEGComp != null) && fileType.startsWith("jp") && JAIHelper.isJAIused()) { saveAsJPEG(jpgFlag, imageToSave, JPEGcompression, new BufferedOutputStream(new FileOutputStream( outputFileName))); } else { BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream(new File(outputFileName))); ImageIO.write(imageToSave, fileType, bos); bos.flush(); bos.close(); } // if you just want to save the image, use something like // javax.imageio.ImageIO.write((java.awt.image.RenderedImage)image_to_save,"png",new // java.io.FileOutputStream(output_dir + page + // image_name+".png")); } imageToSave.flush(); if (debug) { System.out.println("Created : " + outputFileName); } } } /** test to see if string or number */ private static boolean isNumber(String value) { // assume true and see if proved wrong boolean isNumber = true; int charCount = value.length(); for (int i = 0; i < charCount; i++) { char c = value.charAt(i); if ((c < '0') | (c > '9')) { isNumber = false; i = charCount; } } return isNumber; } private static void saveAsJPEG(String jpgFlag, BufferedImage image_to_save, float JPEGcompression, BufferedOutputStream fos) throws IOException { // useful documentation at // http://docs.oracle.com/javase/7/docs/api/javax/imageio/metadata/doc-files/jpeg_metadata.html // useful example program at // http://johnbokma.com/java/obtaining-image-metadata.html to output // JPEG data // old jpeg class // com.sun.image.codec.jpeg.JPEGImageEncoder jpegEncoder = // com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(fos); // com.sun.image.codec.jpeg.JPEGEncodeParam jpegEncodeParam = // jpegEncoder.getDefaultJPEGEncodeParam(image_to_save); // Image writer JPEGImageWriter imageWriter = (JPEGImageWriter) ImageIO .getImageWritersBySuffix("jpeg").next(); ImageOutputStream ios = ImageIO.createImageOutputStream(fos); imageWriter.setOutput(ios); // and metadata IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata( new ImageTypeSpecifier(image_to_save), null); if (jpgFlag != null) { int dpi = 96; try { dpi = Integer.parseInt(jpgFlag); } catch (Exception e) { e.printStackTrace(); } // old metadata // jpegEncodeParam.setDensityUnit(com.sun.image.codec.jpeg.JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH); // jpegEncodeParam.setXDensity(dpi); // jpegEncodeParam.setYDensity(dpi); // new metadata Element tree = (Element) imageMetaData .getAsTree("javax_imageio_jpeg_image_1.0"); Element jfif = (Element) tree.getElementsByTagName("app0JFIF") .item(0); jfif.setAttribute("Xdensity", Integer.toString(dpi)); jfif.setAttribute("Ydensity", Integer.toString(dpi)); } if (JPEGcompression >= 0 && JPEGcompression <= 1f) { // old compression // jpegEncodeParam.setQuality(JPEGcompression,false); // new Compression JPEGImageWriteParam jpegParams = (JPEGImageWriteParam) imageWriter .getDefaultWriteParam(); jpegParams.setCompressionMode(JPEGImageWriteParam.MODE_EXPLICIT); jpegParams.setCompressionQuality(JPEGcompression); } // old write and clean // jpegEncoder.encode(image_to_save, jpegEncodeParam); // new Write and clean up imageWriter.write(imageMetaData, new IIOImage(image_to_save, null, null), null); ios.close(); imageWriter.dispose(); } public static void main(String[] args) { // TODO Auto-generated method stub try { ConvertPagesToHiResImages test = new ConvertPagesToHiResImages( "jpg", "E:\\123.PDF"); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }

jpedal是开源纯Java的PDF文档解析库，可以用来读取PDF文档中的文字、图形。以上文件是核心引用的jar包。

JPedal是一个收费的PDF处理类在官网下载的只能试用30天非常讨厌，这里提供破解版

jpedal.jar 破解版的Jpedal.jar jpedal 1、jpedal文档：http://javadoc.idrsolutions.com/org/jpedal/PdfDecoder.html 2、简单调用示例：http://www.idrsolutions.com/java-pdf-code-faq/#pdf2img 3、lgpl授权的jpedal库的下载地址：http://sourceforge.net/projects/jpedal/